Thanks VERY MUCH for the help, you have enabled me to fix the problem. No "DefaultCommandType" was specified in the ABusinessObject (I forget to set it before generating Entities). So it appears that most SQL requests were treated as Dynamic SQL (hence the incorrect format when calling SP's). The fog is now starting to clear on the use of Dynamic SQL statements and SP's. I was a bit confused by the option to "Use Dynamic SQL" when generating the BizObjects but then use "Stored Procedures" when generating the custom data access classes. That's what happens when you put a VFP bloke into .NET!